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[net-next,10/12] net: lan966x: ditch tx->last_in_use variable

Message ID 20240905-fdma-lan966x-v1-10-e083f8620165@microchip.com (mailing list archive)
State Accepted
Commit c06fef96c7d599ac6d1cdfd42ffee8c8d59729fe
Delegated to: Netdev Maintainers
Headers show
Series net: lan966x: use the newly introduced FDMA library | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 16 this patch: 16
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 7 of 7 maintainers
netdev/build_clang success Errors and warnings before: 16 this patch: 16
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 16 this patch: 16
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 74 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-09-07--06-00 (tests: 722)

Commit Message

Daniel Machon Sept. 5, 2024, 8:06 a.m. UTC 
This variable is used in the tx path to determine the last used DCB. The
library has the variable last_dcb for the exact same purpose. Ditch the
last_in_use variable throughout.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
 .../net/ethernet/microchip/lan966x/lan966x_fdma.c    | 20 ++++----------------
 .../net/ethernet/microchip/lan966x/lan966x_main.h    |  2 --
 2 files changed, 4 insertions(+), 18 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
index 6f7e3c27c1a7..b5a97c5a2e1b 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
@@ -293,7 +293,6 @@  static void lan966x_fdma_tx_disable(struct lan966x_tx *tx)
 		lan966x, FDMA_CH_DB_DISCARD);
 
 	tx->activated = false;
-	tx->last_in_use = -1;
 }
 
 static void lan966x_fdma_tx_reload(struct lan966x_tx *tx)
@@ -598,34 +597,24 @@  static int lan966x_fdma_get_next_dcb(struct lan966x_tx *tx)
 
 	for (i = 0; i < fdma->n_dcbs; ++i) {
 		dcb_buf = &tx->dcbs_buf[i];
-		if (!dcb_buf->used && i != tx->last_in_use)
+		if (!dcb_buf->used && &fdma->dcbs[i] != fdma->last_dcb)
 			return i;
 	}
 
 	return -1;
 }
 
-static void lan966x_fdma_tx_start(struct lan966x_tx *tx, int next_to_use)
+static void lan966x_fdma_tx_start(struct lan966x_tx *tx)
 {
 	struct lan966x *lan966x = tx->lan966x;
-	struct fdma *fdma = &tx->fdma;
-	struct fdma_dcb *dcb;
 
 	if (likely(lan966x->tx.activated)) {
-		/* Connect current dcb to the next db */
-		dcb = &fdma->dcbs[tx->last_in_use];
-		dcb->nextptr = fdma->dma + (next_to_use *
-					  sizeof(struct fdma_dcb));
-
 		lan966x_fdma_tx_reload(tx);
 	} else {
 		/* Because it is first time, then just activate */
 		lan966x->tx.activated = true;
 		lan966x_fdma_tx_activate(tx);
 	}
-
-	/* Move to next dcb because this last in use */
-	tx->last_in_use = next_to_use;
 }
 
 int lan966x_fdma_xmit_xdpf(struct lan966x_port *port, void *ptr, u32 len)
@@ -716,7 +705,7 @@  int lan966x_fdma_xmit_xdpf(struct lan966x_port *port, void *ptr, u32 len)
 		       &lan966x_fdma_xdp_tx_dataptr_cb);
 
 	/* Start the transmission */
-	lan966x_fdma_tx_start(tx, next_to_use);
+	lan966x_fdma_tx_start(tx);
 
 out:
 	spin_unlock(&lan966x->tx_lock);
@@ -799,7 +788,7 @@  int lan966x_fdma_xmit(struct sk_buff *skb, __be32 *ifh, struct net_device *dev)
 		next_dcb_buf->ptp = true;
 
 	/* Start the transmission */
-	lan966x_fdma_tx_start(tx, next_to_use);
+	lan966x_fdma_tx_start(tx);
 
 	return NETDEV_TX_OK;
 
@@ -985,7 +974,6 @@  int lan966x_fdma_init(struct lan966x *lan966x)
 	lan966x->tx.fdma.db_size = PAGE_SIZE << lan966x->rx.page_order;
 	lan966x->tx.fdma.ops.nextptr_cb = &fdma_nextptr_cb;
 	lan966x->tx.fdma.ops.dataptr_cb = &lan966x_fdma_tx_dataptr_cb;
-	lan966x->tx.last_in_use = -1;
 
 	err = lan966x_fdma_rx_alloc(&lan966x->rx);
 	if (err)
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index 99efc596c9e6..25cb2f61986f 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -232,8 +232,6 @@  struct lan966x_tx {
 
 	struct fdma fdma;
 
-	u16 last_in_use;
-
 	/* Array of dcbs that are given to the HW */
 	struct lan966x_tx_dcb_buf *dcbs_buf;